Try the following:
Disconnect the driveshafts by removing the top turnbuckle. (pair of pliers and twist)
Try the throttle to see if the noise has stopped, this will rule out the drive shafts.
If its still there take the pinion off the motor, and turn the spur by hand to see if it turns smoothly, if not the problem is in the gearbox. (check for tight spots etc)
Its also worth lifting the wishbones up to a more realistic angle as someone else has already said.
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